Heath Ledger

Heath Ledger was only 28 when he died of an accidental prescription drug overdose in New York. Six months later, "The Dark Knight" hit theaters. He played the Joker as a terrifying, utterly amoral psychopath, and the role won him a posthumous Academy Award. But that wasn't his last movie -- he had filmed about a third of his role in "The Imaginarium of Dr. Parnassus." His part was taken over by Johnny Depp, Jude Law and Colin Farrell -- and all three actors donated their fees from the film to Ledger's daughter.

Heath Ledger was only 28 when he died of an accidental prescription drug overdose in New York. Six months later, "The Dark Knight" hit theaters. He played the Joker as a terrifying, utterly amoral psychopath, and the role won him a posthumous Academy Award. But that wasn't his last movie -- he had filmed about a third of his role in "The Imaginarium of Dr. Parnassus." His part was taken over by Johnny Depp, Jude Law and Colin Farrell -- and all three actors donated their fees from the film to Ledger's daughter. (Getty Images)

Heath Ledger was only 28 when he died of an accidental prescription drug overdose in New York. Six months later, "The Dark Knight" hit theaters. He played the Joker as a terrifying, utterly amoral psychopath, and the role won him a posthumous Academy Award. But that wasn't his last movie -- he had filmed about a third of his role in "The Imaginarium of Dr. Parnassus." His part was taken over by Johnny Depp, Jude Law and Colin Farrell -- and all three actors donated their fees from the film to Ledger's daughter.Getty Images